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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Ambiguity isn't caught when a derived class is passed to a function template taking a `simple-template-id`"
href="http://llvm.org/bugs/show_bug.cgi?id=18834">18834</a>
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<th>Summary</th>
<td>Ambiguity isn't caught when a derived class is passed to a function template taking a `simple-template-id`
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>filip.roseen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>template<typename>
struct Base { };
struct Derived : Base<void>, Base<void*> { };
template<template<typename> class TT, typename T>
void func (TT<T>) { }
int main () {
func (Derived { });
}
- - - - - - - - - - - - - - - - - - - - - - - - - -
[temp.deduct.call]/5 says that if an ambigiuity is found when trying to deduce
template type parameters the code is illformed and type deduction fails.
clang incorrectly accepts the provided snippet, even though `func<Base,void>`
and `func<Base,void*>` are equally possible alternatives.
Currently `func (Derived { })` will be called with `TT = Base, T = void*` (ie.
the last matching base).</pre>
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